Cutter for nail-machines



W. WIGKERSHAM.

GHINES. I Patented Oct. 30, 1883.

my m UNIT D STATES PATENT OFFIC WILLIAM wio ERsHAM, or WORCESTER, MASSACHUSETTS.

/ CUTTER FOR NAIL-MACHINES.

SPECIFICATION forming part of Letters Patent .No. 287,600,- dated October 30, 1 883.

, Application filed January 30, 1883, (X model.) 1

in cut nails and the kind of cutters by which,

the defective nails are made, and'then I can the more clearly show how myinvention remedies this defect in cut nails.

The metallic sheet from which nails are cut is compressible, so that in cutting off a narrow strip from a sheet with'a pair of shears or cutters in a nail-machine that part of the strip which the shear-blade approaches 'is compressed a little close to its edge before it is severed from the sheet, and in cutting a nail from a sheet (as all nails are cut) so that two out edges thus compressed meet to form a point to the nail, one side of the nail at said point will be compressed or a little rounded, while the other side will be straight, as it is pressed against a straight edge while the nail is being severed from the sheet, and thus one side of the nail at the point beingstraight and the other side being rounded gives the nail a tendency to change its direction as it passes through the wood when driven in, and this defeet in the nail is due tothe act of cutting while both blades of the shears or cutters are straight.

Now, my invention consists in a cutter for shearing off the nail, formed with a projection on that part of its cutting-edge which shears off the point of the nail from the sheet, making a counter indentation-that is, making a v compression on the opposite side of the nail at the point to that above described, which was made by the act of cutting, which I will show more fully by a reference to my drawings,

v position.

old way,

a a are my upper and-double cutter-stock, b I) my lower cutter-stock, which cutter-stocks have a rocking motion on their journals 0' a, working in boxes in the frame A. This rocking motion is produced by the crank d on the main shaft 6 through the connectionrods 73 i, the rod 2' being hinged to the cutterstock I) b at m, and the rod 'i being hinged to the same pin, m, at one end, and also hinged to the cutter-stock a a at n at the other end, in such mannerthat when the main shaft is moved in the direction indicated by the arrow-point p the cutter f will move forward toward the lower end of the nail-plate o 0, while the cutterj" will also. be moved forward'on the other side toward the plate 0 0, and closeto and above the cutter f as their cutting-edges pass alittle by each other, at. the same time shearing off a nail" from the lower extremity of the nailplate 0 0, and then as the main shaft continues to turn these cutters f and f after shearing g off a nail, will recede from the sheet 0 0, which meantime will be fed downward far enough for by my cutter, also showing a nail made in the the width of a nail by a mechanism well known from the plate 0 0, which is fed down through a groove in the guide q.

My cutters are attachedto the cutter-stocks I a ct and b b by the bolts 1 1" 1'- 1', (shown on a large scale at Fig. 2, where the cutter f is shown in cross-section, and the bolt 1" isshown in its position in the cutter and cutter stock.) 8 s s s are four set-screws to hold the cutters in My cutters are madea little shearingthat is, the angle at h is a little acute, the dotted line at t being at, right angles with the sides of the cutter, so that the cutting of'the nail begins at h and progresses toward g.

At Fig; 3 thereare three views of the nail.

At 'wis a nail'cut i n the ordinary way with a cutter having a straight edge, and by the 00111- pression of the metal by the operation of cutting, the point at a: is a little indented on one side, while the other side is straight, giving the nail a tendency to turn to one side as it is driven into the wood, and to remedy this I make a counter-indentation on the other side at the point, as shown at 1), Fig. 3. This counter-indentation is made by a small projection,

, g, on the cutting-edge g h of the cutter f.

Atf, Fig. 2, is shown a portion of the face and edge of the cutter 011 a large scale, showing more plainly the projection g on the edge This projection 9, while in the act of shearing off the nail,shapes the point, as shown at 22, Fig. 8, making the indentations on the two sides of the point equal, or nearly so. At w is shown a side view of my nail.

I will only say, further, that it is the lower cutters which need the projection g-that is, when the nail-plate is fed downward; also, that the cutting-edges of the upper cutters,

f f', are at right angles with their sides, and that they are so adjusted that in their farthest forward movement they will just come in contact with the nail-plate 0 0, while the other cutters, ff, advance far enough to sever the nail from said nail-plate, passing a little by the edges of the upper cutters, all theshear being on the lower cutters.

Having thus described my invention, I will state my claim as follows:

In nail-cutting machines, wherein two out ters co-operate to out nails from the edge of a sheet, 011 the principle of the co-opcration of 3 two blades of shears, the projection g on the cuttingedge g h of one of the cuttersfln combination with the two co-operating blades or euttersf and f substantially as described, and for the purpose set forth.

\VILLIAM XVIGKERSHAM. \Vitnesses:

DAVID MANNING, J r., Gulls. \V. \Vooi). 

